US Bridges

State Route 1 over Santa Rosa Creek

Good

San Luis Obispo County, California · 05-SLO-001-49.89 · Structure no. 49 0186

Built
1963
62 years old
Condition
Good
inspected September 2023
Type
Tee Beam
Concrete Continuous
Length
122 ft
3 main spans
Daily traffic
6,000
2009 count
Owner
State
State Highway Agency

About this bridge

State Route 1 over Santa Rosa Creek is a concrete continuous tee beam carrying State Route 1 over Santa Rosa Creek in San Luis Obispo County, California. It was built in 1963, so it is 62 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 6,000 vehicles a day, projected to reach 8,795 by 2045. The structure is 122 ft (37.2 m) long and 43 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesState Route 1
CrossesSanta Rosa Creek
Location05-SLO-001-49.89
RouteState Highway 1
CountySan Luis Obispo County
StateCalifornia
Coordinates35.56084, -121.09489
Functional classUrban Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41.4 US tons
Inventory rating32.2 US tons

Structure

Structure typeTee Beam
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length122 ft (37.2 m)
Longest span54 ft (16.5 m)
Deck width43 ft (13 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,000 (2009)
Projected traffic8,795 by 2045
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was State Route 1 over Santa Rosa Creek built?

It was built in 1963, making it 62 years old in 2025.

What condition is State Route 1 over Santa Rosa Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2023.

How much traffic does State Route 1 over Santa Rosa Creek carry?

About 6,000 vehicles per day (2009 count).

How long is State Route 1 over Santa Rosa Creek?

The structure is 122 ft (37.2 m) long with a longest span of 54 ft (16.5 m) and a deck 43 ft wide.

Who owns State Route 1 over Santa Rosa Creek?

It is owned by the State Highway Agency.